/*
 * Copyright [2020] [MaxKey of copyright http://www.maxkey.top]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.maxkey.web.tag;

import java.io.IOException;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;

import freemarker.core.Environment;
import freemarker.template.TemplateDirectiveBody;
import freemarker.template.TemplateDirectiveModel;
import freemarker.template.TemplateException;
import freemarker.template.TemplateModel;

/**
 * 获取应用上下文标签
 * <@pathVar/>
 *
 * @author Crystal.Sea
 */

@FreemarkerTag("pathVar")
public class PathVarTagDirective implements TemplateDirectiveModel {
    @Autowired
    private HttpServletRequest request;

    private int index;
    String pathVariable;

    @Override
    @SuppressWarnings("rawtypes")
    public void execute(Environment env, Map params, TemplateModel[] loopVars, TemplateDirectiveBody body)
            throws TemplateException, IOException {

        index = Integer.parseInt(params.get("index").toString());
        String[] pathVariables = request.getAttribute(org.springframework.web.util.WebUtils.FORWARD_REQUEST_URI_ATTRIBUTE).toString().split("/");

        if (pathVariables == null) {
            pathVariables = request.getRequestURI().split("/");
        }

        if (index == 0) {
            pathVariable = pathVariables[pathVariables.length - 1];
        } else {
            pathVariable = pathVariables[index + 1];
        }
        env.getOut().append(request.getParameter(pathVariable));
    }

}
